Table 2.

Cronbach’s alphas, means, and standard deviations for Mathematics Content Measures created from teacher survey items.

Mathematics Content Measures	ECLS-K:1998−1999			ECLS-K:2010−2011			Mean difference	P-Value
	α	Mean (days/month)	SD	α	Mean (days/month)	SD
Basic Counting & Shapes (4 items)	0.58	12.73	4.16	0.58	13.17	3.94	0.44	0.925
Patterns & Measurement (5 items)	0.78	7.55	4.47	0.78	7.84	4.43	0.29	0.071
Place Value & Currency (4 items)	0.60	8.47	5.18	0.59	10.76	5.30	2.29	0.001
Basic Addition & Subtraction (2 items)	0.88	7.84	6.57	0.86	9.66	6.52	1.82	0.001

Note. Means were generated with the sample weights designed for non-response in each cohort for the spring kindergarten teacher survey. See the appendix text for information regarding the weights used. Only observations in the analysis samples were used (ECLS-K-1999: teacher N= 3020; ECLS-K:2011: teacher N= 3060), and all non-missing cases on each variable were used to calculate each respective mean. See the appendix for means for each item used to generate the content measures. Values in the “difference” column represent the change in the amount of time teachers reported spending on each topic between 1998−1999 and 2010−2011. Positive values indicate that teachers reported spending more time on a given topic in 2010−2011. P-values denote the level of statistical significance for the average change in each reported content measure. They were estimated using dummy-variable regressions in which both cohorts were pooled into a single dataset. P-values smaller than .001 were rounded to .001.